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The Tektronix S-42 is a sampling head for 1300nm optical signals.
{{Plugin Sidebar
|manufacturer=Tektronix
|series=7000 and 3S series sampling heads
|type=S-42
|summary=Optical Sampling Head
|image=Tek s42.jpg
|caption=S42 Head
|introduced=1989
|discontinued=1990
|designers=
|manuals=
* [[Media:070-7191-00.pdf|S-42 Instruction Manual]] (with schematics)
* [[Media:Tek s-42 specifics ordering information.pdf|S-42 Specifications]] (catalog pages)
}}
The '''Tektronix S-42''' is a sampling head for 1300 nm optical signals. It has an [[FC/PC connector|FC/PC fiberoptic connector]] for the input signal. It is essentially an [[S-4]] sampling head with a photodiode at the input.
 
Specified accuracy is for connections through 8/125 μm single-mode fibre, although a lens in front of the photodiode allows connections using multi-mode fibre as well, at some degradation of response speed.
 
The manual shows it being used in a [[7S12]]-driven TDR setup with an external [[OT503|OT503 electro-optic converter]] as the optical signal source.
{{BeginSpecs}}
{{Spec | Pulse response            | 55 ps }}
{{Spec | Bandwidth                | 6.4 GHz (equiv.) }}
{{Spec | Spectral response        | 1000 – 1700 nm }}
{{Spec | Deflection                | 50 μW/Div to 50 mW/Div @ 1300 nm }}
{{Spec | Noise equivalent power    | 42 μW<sub>RMS</sub> max. }}
{{Spec | Max. nondestructive input | 10 mW mean, 125 mW peak }}
{{Spec | Features |
* Mean power meter, dynamic range 5 nW to 5 mW (60 dB), bandwidth 100 Hz
}}
{{EndSpecs}}
 
==Internals==
 
The S-42 borrows heavily from the [[S-4]] sampling head, re-using the S-4 strobe, sampler and preamp boards.
It uses the same six-diode traveling-wave sampling gate, strobed by 125 ps pulses generated using a [[snap-off diode]] driven by an avalanche transistor.
 
The S-4's SMA input connector is still present internally, and driven electrically in some of the calibration procedures, with the photodiode removed.
 
To accommodate the photo diode, the S-42's case is longer than the S-4's. When inserted, the S-42 therefore protrudes from the base unit by about two centimeters.
 
==Pictures==


<gallery>
<gallery>
Image:Tek s42.jpg
Tek s-42 a.JPG
Tek s-42 b.JPG
Tek s-42 e.JPG
Tek s-42 d.JPG
Tek s42.jpg
Tek s-42 block diag.png    | block diagram
Tek_s-42 schem.png        | schematic
s42-spectral-response.jpg  | S-42 spectral response
s42-explosion-diagram.jpg
Tek S-42 1989 catalog.png  | Description in [[Tek Catalogs|1989 Catalog]]
Tek s-42 uncapped.jpg
</gallery>
</gallery>
[[Category:7000 and 3S series sampling heads]]
[[Category:Optoelectronic instruments]]

Latest revision as of 08:03, 10 March 2022

Tektronix S-42
Optical Sampling Head
S42 Head

Compatible with 7000 and 3S series sampling heads

Produced from 1989 to 1990

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix S-42 is a sampling head for 1300 nm optical signals. It has an FC/PC fiberoptic connector for the input signal. It is essentially an S-4 sampling head with a photodiode at the input.

Specified accuracy is for connections through 8/125 μm single-mode fibre, although a lens in front of the photodiode allows connections using multi-mode fibre as well, at some degradation of response speed.

The manual shows it being used in a 7S12-driven TDR setup with an external OT503 electro-optic converter as the optical signal source.

Key Specifications

Pulse response 55 ps
Bandwidth 6.4 GHz (equiv.)
Spectral response 1000 – 1700 nm
Deflection 50 μW/Div to 50 mW/Div @ 1300 nm
Noise equivalent power 42 μWRMS max.
Max. nondestructive input 10 mW mean, 125 mW peak
Features
  • Mean power meter, dynamic range 5 nW to 5 mW (60 dB), bandwidth 100 Hz

Internals

The S-42 borrows heavily from the S-4 sampling head, re-using the S-4 strobe, sampler and preamp boards. It uses the same six-diode traveling-wave sampling gate, strobed by 125 ps pulses generated using a snap-off diode driven by an avalanche transistor.

The S-4's SMA input connector is still present internally, and driven electrically in some of the calibration procedures, with the photodiode removed.

To accommodate the photo diode, the S-42's case is longer than the S-4's. When inserted, the S-42 therefore protrudes from the base unit by about two centimeters.

Pictures